DE102018112877A1 - Determination of the nitrogen oxide concentration in the engine exhaust - Google Patents
Determination of the nitrogen oxide concentration in the engine exhaust Download PDFInfo
- Publication number
- DE102018112877A1 DE102018112877A1 DE102018112877.0A DE102018112877A DE102018112877A1 DE 102018112877 A1 DE102018112877 A1 DE 102018112877A1 DE 102018112877 A DE102018112877 A DE 102018112877A DE 102018112877 A1 DE102018112877 A1 DE 102018112877A1
- Authority
- DE
- Germany
- Prior art keywords
- nox
- engine
- determining
- concentration
- exhaust
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/02—Circuit arrangements for generating control signals
- F02D41/18—Circuit arrangements for generating control signals by measuring intake air flow
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N11/00—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
- F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
- F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
- F01N3/2066—Selective catalytic reduction [SCR]
- F01N3/208—Control of selective catalytic reduction [SCR], e.g. dosing of reducing agent
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N9/00—Electrical control of exhaust gas treating apparatus
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D29/00—Controlling engines, such controlling being peculiar to the devices driven thereby, the devices being other than parts or accessories essential to engine operation, e.g. controlling of engines by signals external thereto
- F02D29/02—Controlling engines, such controlling being peculiar to the devices driven thereby, the devices being other than parts or accessories essential to engine operation, e.g. controlling of engines by signals external thereto peculiar to engines driving vehicles; peculiar to engines driving variable pitch propellers
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/0025—Controlling engines characterised by use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
- F02D41/0047—Controlling exhaust gas recirculation [EGR]
- F02D41/005—Controlling exhaust gas recirculation [EGR] according to engine operating conditions
- F02D41/0055—Special engine operating conditions, e.g. for regeneration of exhaust gas treatment apparatus
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/0025—Controlling engines characterised by use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
- F02D41/0047—Controlling exhaust gas recirculation [EGR]
- F02D41/0065—Specific aspects of external EGR control
- F02D41/0072—Estimating, calculating or determining the EGR rate, amount or flow
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/02—Circuit arrangements for generating control signals
- F02D41/14—Introducing closed-loop corrections
- F02D41/1438—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor
- F02D41/1444—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases
- F02D41/1448—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases the characteristics being an exhaust gas pressure
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/02—Circuit arrangements for generating control signals
- F02D41/14—Introducing closed-loop corrections
- F02D41/1438—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor
- F02D41/1444—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases
- F02D41/146—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases the characteristics being an NOx content or concentration
- F02D41/1461—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases the characteristics being an NOx content or concentration of the exhaust gases emitted by the engine
- F02D41/1462—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases the characteristics being an NOx content or concentration of the exhaust gases emitted by the engine with determination means using an estimation
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/30—Controlling fuel injection
- F02D41/38—Controlling fuel injection of the high pressure type
- F02D41/40—Controlling fuel injection of the high pressure type with means for controlling injection timing or duration
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
- F02M26/02—EGR systems specially adapted for supercharged engines
- F02M26/04—EGR systems specially adapted for supercharged engines with a single turbocharger
- F02M26/05—High pressure loops, i.e. wherein recirculated exhaust gas is taken out from the exhaust system upstream of the turbine and reintroduced into the intake system downstream of the compressor
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
- F02M26/02—EGR systems specially adapted for supercharged engines
- F02M26/04—EGR systems specially adapted for supercharged engines with a single turbocharger
- F02M26/06—Low pressure loops, i.e. wherein recirculated exhaust gas is taken out from the exhaust downstream of the turbocharger turbine and reintroduced into the intake system upstream of the compressor
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B47/00—Methods of operating engines involving adding non-fuel substances or anti-knock agents to combustion air, fuel, or fuel-air mixtures of engines
- F02B47/04—Methods of operating engines involving adding non-fuel substances or anti-knock agents to combustion air, fuel, or fuel-air mixtures of engines the substances being other than water or steam only
- F02B47/08—Methods of operating engines involving adding non-fuel substances or anti-knock agents to combustion air, fuel, or fuel-air mixtures of engines the substances being other than water or steam only the substances including exhaust gas
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D21/00—Controlling engines characterised by their being supplied with non-airborne oxygen or other non-fuel gas
- F02D21/06—Controlling engines characterised by their being supplied with non-airborne oxygen or other non-fuel gas peculiar to engines having other non-fuel gas added to combustion air
- F02D21/08—Controlling engines characterised by their being supplied with non-airborne oxygen or other non-fuel gas peculiar to engines having other non-fuel gas added to combustion air the other gas being the exhaust gas of engine
- F02D2021/083—Controlling engines characterised by their being supplied with non-airborne oxygen or other non-fuel gas peculiar to engines having other non-fuel gas added to combustion air the other gas being the exhaust gas of engine controlling exhaust gas recirculation electronically
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D2200/00—Input parameters for engine control
- F02D2200/02—Input parameters for engine control the parameters being related to the engine
- F02D2200/021—Engine temperature
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D2200/00—Input parameters for engine control
- F02D2200/02—Input parameters for engine control the parameters being related to the engine
- F02D2200/04—Engine intake system parameters
- F02D2200/0414—Air temperature
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/30—Controlling fuel injection
- F02D41/38—Controlling fuel injection of the high pressure type
- F02D41/40—Controlling fuel injection of the high pressure type with means for controlling injection timing or duration
- F02D41/402—Multiple injections
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/40—Engine management systems
Abstract
Ein Verfahren zum Betreiben eines Verbrennungsmotors, mit einem Turbolader, um einen Ansaugluftstrom unter Druck zu setzen und einem Abgasnachbehandlungssystem (AN) einschließlich einer AN-Vorrichtung zum Reduzieren der Stickstoffoxid-(NOx) Konzentration im vom Motor erzeugten Abgas. Das Verfahren beinhaltet das Betreiben des Motors mit einer Teilung der variablen Abgasrückführung (AGR) unter hohem Druck und der AGR unter niedrigem Druck im Ansaugluftstrom. Das Verfahren beinhaltet auch das Ermitteln der Konzentration von NOx im Abgas und das Ermitteln einer aktuellen Teilung der AGR unter hohem Druck und der AGR unter niedrigem Druck im Ansaugluftstrom. Das Verfahren beinhaltet darüber hinaus das Ermitteln eines AGR-Korrekturfaktors unter Verwendung der ermittelten aktuellen Teilung der AGR unter hohem Druck und der AGR unter niedrigem Druck und das Anwenden des ermittelten AGR-Korrekturfaktors auf die ermittelte Konzentration von NOx, um eine korrigierte Konzentration von NOx zu generieren. Ferner beinhaltet das Verfahren das Regeln des Betriebs des AN-systems, um das Abgas über die AN-Vorrichtung in Reaktion auf die generierte korrigierte Konzentration von NOx zu behandeln.A method of operating an internal combustion engine with a turbocharger to pressurize an intake air flow and an exhaust aftertreatment system (AN) including an AN device for reducing the concentration of nitrogen oxide (NOx) in the exhaust gas produced by the engine. The method includes operating the engine at a variable pressure exhaust gas recirculation (EGR) split and EGR at low pressure in the intake air flow. The method also includes determining the concentration of NOx in the exhaust gas and determining a current high pressure EGR split and the low pressure EGR flow in the intake air stream. The method further includes determining an EGR correction factor using the determined actual split of the high pressure EGR and the low pressure EGR and applying the determined EGR correction factor to the determined concentration of NOx to a corrected concentration of NOx to generate. Further, the method includes regulating the operation of the on-system to treat the exhaust via the on-device in response to the generated corrected concentration of NOx.
Description
EINLEITUNGINTRODUCTION
Die vorliegende Offenbarung betrifft die Bestimmung der Stickoxid-(NOx)-Emissionskonzentration im Abgas eines Verbrennungsmotors.The present disclosure relates to the determination of the nitrogen oxide (NOx) emission concentration in the exhaust gas of an internal combustion engine.
Moderne Verbrennungsmotoren verwenden in der Regel Abgasnachbehandlungssysteme (AT), die Partikelfilter und sonstige Vorrichtungen beinhalten, um die Abgasemissionen von Verbrennungsmotoren wirksam zu begrenzen. Eine der häufig verwendeten Vorrichtungen zur Abgasnachbehandlung bei einem modernen magerlauffähigen Verbrennungsmotor, wie etwa einem Selbstzünder- oder Dieselmotor, ist ein selektiver katalytischer Reduktions (SCR)-Katalysator.Modern internal combustion engines typically use exhaust aftertreatment (AT) systems that include particulate filters and other devices to effectively limit the exhaust emissions of internal combustion engines. One of the commonly used exhaust aftertreatment devices in a modern lean burn internal combustion engine, such as a diesel or diesel engine, is a selective catalytic reduction (SCR) catalyst.
Der SCR ist dazu konfiguriert, Stickoxide (NOx) in zweiatomigen Stickstoff (N2) und Wasser (H2O) mit Hilfe der NO2, die durch eine weitere Vorrichtung zur Abgasnachbehandlung erzeugt wird, umzuwandeln, typischerweise dem Diesel-Oxidationskatalysator (DOC nach Diesel Oxidation Catalyst). Zur effektiven Entfernung von NOx erfordert der SCR-Umwandlungsprozess zudem eine vorgegebene Menge von Ammoniak (NH3) im Abgasstrom.The SCR is configured to convert nitrogen oxides (NOx) into diatomic nitrogen (N 2 ) and water (H 2 O) with the aid of NO 2 generated by another exhaust aftertreatment device, typically the diesel oxidation catalyst (DOC) Diesel oxidation catalyst). For the effective removal of NOx, the SCR conversion process also requires a predetermined amount of ammonia (NH 3 ) in the exhaust stream.
Der SCR-Umwandlungsprozess kann zudem eine gesteuerte oder gemessene Menge eines Reduktionsmittels in den Abgasstrom erfordern, das allgemein den Namen „Diesel-Abgas-Fluid“ (DEF) hat, wenn das Reduktionsmittel in Dieselmotoren verwendet wird. Diese Art Reduktionsmittel kann eine wässrige Harnstofflösung sein, die Wasser und Ammoniak beinhaltet.The SCR conversion process may also require a controlled or measured amount of reductant reducing agent, generally called "diesel exhaust fluid" (DEF), when the reductant is used in diesel engines. This type of reducing agent may be an aqueous urea solution containing water and ammonia.
Um den SCR-Umwandlungsprozess zu ermöglichen und um die Reduktion und/oder Entfernung von NOx-Emissionen zu gewährleisten, kann eine wirksame Bestimmung der NOx-Konzentration im Abgasstrom vom Motor von wesentlicher Bedeutung sein.In order to facilitate the SCR conversion process and to ensure the reduction and / or removal of NOx emissions, effective determination of the NOx concentration in the exhaust stream from the engine may be essential.
KURZDARSTELLUNGSUMMARY
Ein Verfahren zum Betreiben eines Verbrennungsmotors mit einem Turbolader, der konfiguriert ist, um den Ansaugluftstrom unter Druck zu setzen und ein Abgasnachbehandlungssystem (AT) einschließlich einer AT-Vorrichtung, die konfiguriert ist, um eine Konzentration von Stickstoffoxid (NOx) in einem vom Motor erzeugten Abgas zu reduzieren. Der Motor kann ein Selbstzündermotor sein. Das Verfahren beinhaltet das Betreiben des Motors mit einer Teilung der variablen Abgasrückführung (AGR) unter hohem Druck und der AGR unter niedrigem Druck im Ansaugluftstrom. Das Verfahren beinhaltet auch das Ermitteln der Konzentration von NOx im Abgas und das Ermitteln einer aktuellen Teilung der AGR unter hohem Druck und der AGR unter niedrigem Druck im Ansaugluftstrom. Das Verfahren beinhaltet darüber hinaus das Ermitteln eines AGR-Korrekturfaktors unter Verwendung der ermittelten aktuellen Teilung der AGR unter hohem Druck und der AGR unter niedrigem Druck und das Anwenden des ermittelten AGR-Korrekturfaktors auf die ermittelte Konzentration von NOx im Abgas, um eine korrigierte Konzentration von NOx zu generieren. Ferner beinhaltet das Verfahren das Regulieren des Betriebs des AN-systems, um das Abgas über die AN-Vorrichtung in Reaktion auf die generierte korrigierte Konzentration von NOx zu behandeln.A method of operating an internal combustion engine having a turbocharger configured to pressurize the intake air flow and an exhaust aftertreatment system (AT) including an AT device configured to generate a concentration of nitrogen oxide (NOx) in an engine-generated one Reduce exhaust gas. The engine may be a compression ignition engine. The method includes operating the engine at a variable pressure exhaust gas recirculation (EGR) split and EGR at low pressure in the intake air flow. The method also includes determining the concentration of NOx in the exhaust gas and determining a current high pressure EGR split and the low pressure EGR flow in the intake air stream. The method further includes determining an EGR correction factor using the determined actual split of the high pressure EGR and the low pressure EGR and applying the determined EGR correction factor to the determined concentration of NOx in the exhaust gas to obtain a corrected concentration of To generate NOx. Further, the method includes regulating the operation of the on-system to treat the exhaust via the on-device in response to the generated corrected concentration of NOx.
Das Verfahren kann über eine elektronische Steuerung durchgeführt werden, die mit mindestens einer Datennachschlagtabelle programmiert ist. In einem solchen Fall kann die Bestimmung der Konzentration der NOx im Abgas das Zugreifen auf die mindestens einer Datennachschlagtabelle beinhalten.The method may be performed via an electronic controller programmed with at least one data lookup table. In such a case, determining the concentration of NOx in the exhaust may include accessing the at least one data lookup table.
Der Motor kann eine Kraftstoffeinspritzdüse, die über eine Einspritzventilleiste mit Kraftstoff versorgt wird und konfiguriert ist, um Kraftstoff in den Motor einzuspritzen, beinhalten. Zugriff auf die mindestens eine Datennachschlagetabelle kann das Zugreifen auf eine erste Datennachschlagtabelle beinhalten. In einem solchen Fall kann das Verfahren weiterhin das Ermitteln einer Temperatur der angesaugten Luft beinhalten. Darüber hinaus kann das Verfahren das Ermittelten eines Kraftstoffverteilungsdrucks und einer Zeit, die von der Kraftstoffeinspritzdüse verwendet wird, um den Motor zu betreiben; das Ermitteln einer Anzahl von Kraftstoffeinspritzungen; das Ermitteln eines Druckverhältnisses zwischen der Ansaugluft und dem Abgas; das Ermitteln eines Umgebungsfeuchtigkeitsniveaus; und das Ermitteln des Umgebungsdrucks beinhalten. Das Verfahren kann auch das Ermitteln der NOx Konzentration unter Verwendung der ermittelten Temperatur der angesaugten Luft, des Kraftstoffverteilungsdrucks, des Zeitverhaltens der Kraftstoffeinspritzdüse, der Anzahl der Kraftstoffeinspritzungen, des Druckverhältnisses zwischen der Ansaugluft und dem Abgas und des Umgebungsfeuchtigkeitsniveaus in der ersten Datennachschlagetabelle beinhalten.The engine may include a fuel injector fueled via an injection valve manifold and configured to inject fuel into the engine. Access to the at least one data lookup table may include accessing a first data lookup table. In such a case, the method may further include determining a temperature of the intake air. In addition, the method may include determining a fuel distribution pressure and a time used by the fuel injector to operate the engine; determining a number of fuel injections; determining a pressure ratio between the intake air and the exhaust gas; determining an ambient humidity level; and determining the ambient pressure. The method may also include determining the NOx concentration using the sensed intake air temperature, the fuel rail pressure, the fuel injector timing, the number of fuel injections, the intake air to the exhaust pressure ratio, and the ambient humidity level in the first data look-up table.
Zugriff auf die mindestens eine Datennachschlagetabelle kann das Ermitteln des AGR-Korrekturfaktors über das Zugreifen auf eine zweite Datennachschlagetabelle beinhalten.Access to the at least one data lookup table may include determining the EGR correction factor via accessing a second data lookup table.
Das Zugreifen auf die mindestens eine Datennachschlagetabelle kann auch das Anwenden des ermittelten AGR-Korrekturfaktors auf die ermittelte NOx-Konzentration im Abgas über das Anwenden der dritten Datennachschlagetabelle beinhalten, um die korrigierte NOx Konzentration zu generieren.Accessing the at least one data look-up table may also include applying the determined EGR correction factor to the determined NOx concentration in the exhaust via applying the third data look-up table to generate the corrected NOx concentration.
Darüber hinaus kann das Verfahren das Folgende beinhalten: Ermitteln einer Temperatur des Motors; Ermitteln eines Korrekturfaktors der Motortemperatur unter Verwendung der ermittelten Temperatur des Motors; und Anwenden des Korrekturfaktors der Motortemperatur auf die ermittelte NOx-Konzentration im Abgas, um eine weitere korrigierte NOx-Konzentration zu generieren. Das Verfahren kann auch das Regulieren des Betriebs des AN-Systems beinhalten, um die Abgase über die AN-Vorrichtung in Reaktion auf die generierte weiter korrigierte NOx Konzentration zu behandeln. In addition, the method may include: determining a temperature of the engine; Determining a correction factor of the engine temperature using the detected temperature of the engine; and applying the correction factor of the engine temperature to the determined NOx concentration in the exhaust gas to generate a further corrected NOx concentration. The method may also include regulating the operation of the AN system to treat the exhaust gases via the AN device in response to the generated further corrected NOx concentration.
Zugriff auf die mindestens eine Datennachschlagetabelle kann das Ermitteln des Korrekturfaktors der Motortemperatur über das Zugreifen auf eine vierte Datennachschlagetabelle beinhalten. Eine solche Ermittlung des Korrekturfaktors der Motortemperatur kann auf der tatsächlichen Motordrehzahl und Motorlast basieren.Access to the at least one data lookup table may include determining the correction factor of the engine temperature via accessing a fourth data lookup table. Such determination of engine temperature correction factor may be based on actual engine speed and engine load.
Die erste bis vierte Datennachschlagetabelle können Untertabellen einer in der Steuerung programmierten Master-Datennachschlagtabelle sein.The first to fourth data lookup tables may be subtables of a master data lookup table programmed in the controller.
Das Ermitteln der Temperatur des Motors kann das Erfassen einer Kühlmitteltemperatur des Motors über einen Sensor beinhalten.Determining the temperature of the engine may include sensing a coolant temperature of the engine via a sensor.
Die AN-Vorrichtung kann ein Katalysator für selektive katalytische Reduktion (SCR-Katalysator) sein. In einem solchen Fall kann das Regulieren des Betriebs des AN-Systems das Einspritzen eines Reduktionsmittels in das sich stromaufwärts des SCR-Katalysators befindliche Abgas beinhalten.The AN device may be a selective catalytic reduction (SCR) catalyst. In such a case, regulating the operation of the AN system may include injecting a reductant into the exhaust gas located upstream of the SCR catalyst.
Ein Nachbehandlungs (AN)-System für ein Abgas, das von einem Verbrennungsmotor unter Verwendung einer Steuerung erzeugt wird, die zum Ausführen des vorstehenden Verfahrens konfiguriert ist, wird ebenfalls offenbart.An after treatment (AN) system for an exhaust gas generated by an internal combustion engine using a controller configured to carry out the above method is also disclosed.
Es wird auch ein Fahrzeug mit Anwendung des zuvor beschriebenen AN-Systems offenbart.There is also disclosed a vehicle employing the AN system described above.
Die vorstehend aufgeführten Merkmale und Vorteile sowie andere Merkmale und Vorteile der vorliegenden Offenbarung werden aus der folgenden ausführlichen Beschreibung der Ausführungsform(en) und der/den besten Art(en) zur Umsetzung der beschriebenen Offenbarung in Verbindung mit den zugehörigen Zeichnungen und hinzugefügten Ansprüchen ersichtlich.The above-listed features and advantages, as well as other features and advantages of the present disclosure, will become apparent from the following detailed description of the embodiment (s) and best mode (s) for implementing the described disclosure in conjunction with the accompanying drawings and appended claims.
Figurenlistelist of figures
-
1 ist eine schematische Draufsicht eines Fahrzeugs mit einem Verbrennungsmotor, der mit einem Abgassystem verbunden ist, das ein Nachbehandlungs (AN)-System mit einer Anzahl an AN-Vorrichtungen zur Reduzierung der Abgasemissionen aufweist.1 FIG. 12 is a schematic plan view of a vehicle having an internal combustion engine connected to an exhaust system including an after-treatment (AN) system having a number of AN devices for reducing exhaust emissions. -
2 ist eine schematische Darstellung des Verbrennungsmotors, der mit dem Abgassystem mit der in1 dargestellten AN verbunden ist.2 is a schematic representation of the internal combustion engine, with the exhaust system with the in1 connected AN is connected. -
3 ein Flussdiagramm eines Verfahrens zur Verwendung des in1 und2 dargestellten Motors und seines AN-Systems.3 a flowchart of a method for using the in1 and2 represented engine and its AN system.
AUSFÜHRLICHE BESCHREIBUNGDETAILED DESCRIPTION
Unter Bezugnahme auf die Zeichnungen, worin in mehreren Ansichten gleiche Referenznummern auf gleiche Komponenten verweisen, zeigt
Wie ersichtlich, kann der Motor
Die variable Geometrie eines derartigen VGT wird häufig über einen variablen Schaufelmechanismus erreicht (nicht dargestellt). VGTs sind bei Selbstzündungs- oder Dieselmotoren tendenziell häufiger anzutreffen als bei Fremdzündungs- oder Benzinmotoren, da niedrigere Abgastemperaturen eines Dieselmotors eine weniger extreme Umgebung für die beweglichen Komponenten des VGTs darstellen. Obwohl der Motor
Das Fahrzeug
Wie gezeigt, kann die erste AN-Vorrichtung
Die Hauptfunktion des SCR-Katalysators besteht darin, die Konzentration
Das AN-System
Das AN-System
Wie in
Unter weiterer Bezugnahme auf
Das Fahrzeug
Die Steuerung
Die Steuerung
Die Steuerung
Das AN-System
Die Steuerung
Die Datennachschlagetabelle(n)
Im Allgemeinen verwendet das AN-System
Im Rahmen
Nach Rahmen
Im Rahmen
Nach Rahmen
Nach entweder Rahmen
Die ausführliche Beschreibung und die Zeichnungen oder Figuren unterstützen und beschreiben die Offenbarung, während der Umfang der Offenbarung jedoch einzig und allein durch die Patentansprüche definiert wird. Während einige der besten Modi und weitere Ausführungsformen der beanspruchten Offenbarung ausführlich beschrieben wurden, gibt es verschiedene alternative Konzepte und Ausführungsformen zur Umsetzung der in den hinzugefügten Ansprüchen definierten Offenbarung. Darüber hinaus sollen die in den Zeichnungen dargestellten Ausführungsformen oder die Merkmale von verschiedenen Ausführungsformen, die in der vorliegenden Beschreibung erwähnt sind, nicht unbedingt als voneinander unabhängige Ausführungsformen aufgefasst werden. Vielmehr ist es möglich, dass jedes der in einem der Beispiele einer Ausführungsform beschriebenen Merkmale mit einem oder einer Vielzahl von anderen gewünschten Merkmalen aus anderen Ausführungsformen kombiniert werden kann, was andere Ausführungsformen zur Folge hat, die nicht in Worten oder durch Bezugnahme auf Zeichnungen beschrieben sind. Dementsprechend fallen derartige andere Ausführungsformen in den Rahmen des Schutzumfangs der angehängten Ansprüche.The detailed description and drawings or figures are supportive and descriptive of the disclosure, but the scope of the disclosure is defined solely by the claims. While some of the best modes and other embodiments of the claimed disclosure have been described in detail, there are several alternative concepts and embodiments for implementing the disclosure defined in the appended claims. In addition, the embodiments illustrated in the drawings or the features of various embodiments mentioned in the present specification are not necessarily to be construed as independent embodiments. Rather, it is possible that any of the features described in one of the examples of an embodiment may be combined with one or a plurality of other desired features from other embodiments, resulting in other embodiments that are not described in words or by reference to drawings , Accordingly, such other embodiments are within the scope of the scope of the appended claims.
Claims (10)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US15/608501 | 2017-05-30 | ||
US15/608,501 US10190521B2 (en) | 2017-05-30 | 2017-05-30 | Determination of nitrogen oxide concentration in engine exhaust gas |
Publications (2)
Publication Number | Publication Date |
---|---|
DE102018112877A1 true DE102018112877A1 (en) | 2018-12-06 |
DE102018112877B4 DE102018112877B4 (en) | 2021-08-12 |
Family
ID=64279107
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE102018112877.0A Expired - Fee Related DE102018112877B4 (en) | 2017-05-30 | 2018-05-29 | Determination of the nitrogen oxide concentration in the engine exhaust |
Country Status (3)
Country | Link |
---|---|
US (1) | US10190521B2 (en) |
CN (1) | CN108979814B (en) |
DE (1) | DE102018112877B4 (en) |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP3728802B2 (en) * | 1996-06-03 | 2005-12-21 | 日産自動車株式会社 | NOx concentration estimation device and exhaust gas recirculation failure diagnosis device for internal combustion engine |
KR19990083414A (en) * | 1998-04-27 | 1999-11-25 | 카와무라 히데오 | A Purifying system for exhaust gas and controlling method thereof |
US8813690B2 (en) | 2009-10-30 | 2014-08-26 | Cummins Inc. | Engine control techniques to account for fuel effects |
EP2339152B1 (en) * | 2009-12-23 | 2013-06-19 | FPT Motorenforschung AG | Method and device for controlling an EGR system in a combustion engines |
US9279375B2 (en) | 2013-06-05 | 2016-03-08 | Ford Global Technologies, Llc | System and method for controlling an engine that includes low pressure EGR |
JP2017036697A (en) * | 2015-08-10 | 2017-02-16 | いすゞ自動車株式会社 | Egr control system for internal combustion engine, internal combustion engine and egr control method for internal combustion engine |
-
2017
- 2017-05-30 US US15/608,501 patent/US10190521B2/en not_active Expired - Fee Related
-
2018
- 2018-05-10 CN CN201810442330.4A patent/CN108979814B/en not_active Expired - Fee Related
- 2018-05-29 DE DE102018112877.0A patent/DE102018112877B4/en not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
CN108979814B (en) | 2020-12-08 |
US20180347495A1 (en) | 2018-12-06 |
DE102018112877B4 (en) | 2021-08-12 |
US10190521B2 (en) | 2019-01-29 |
CN108979814A (en) | 2018-12-11 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
DE60314360T2 (en) | Emission control system for increasing the performance of a selective catalytic reduction | |
DE102010046747B4 (en) | Petrol particulate filter regeneration and diagnosis | |
DE102016223558B4 (en) | Exhaust gas purification with double reducing agent introduction | |
DE102010034287B4 (en) | System for controlling reductant injection into a selective catalytic reduction system | |
DE102010063444B4 (en) | Emissions system control procedures and systems | |
DE102007044191B4 (en) | Apparatus and method for injecting a reducing agent into an exhaust stream | |
DE102014105210B4 (en) | System and method for cleaning exhaust gas | |
DE102011080625B4 (en) | METHOD FOR REDUCING UREA DEPOSITS IN A POST-TREATMENT SYSTEM | |
DE102011120316B4 (en) | A method for determining the performance of a selective catalytic reduction dosing system using an ammonia sensor | |
DE102011105551B4 (en) | System for determining age and controlling a catalyst for selective catalytic reduction | |
DE102009011469B4 (en) | Fault control strategy for urea SCR NOX reduction at low temperatures | |
DE102011018929B4 (en) | Control system to prevent hydrocarbon slip during regeneration of a particulate filter | |
DE102010063871A1 (en) | Emission control system and systems | |
DE102010063425A1 (en) | Methods and systems for controlling emission systems | |
DE102010054601A1 (en) | An exhaust aftertreatment system for a diesel engine and method for increasing a temperature of an SCR catalyst to reduce NOx in exhaust gases | |
DE112013004508T5 (en) | Procedures for increasing exhaust gas temperatures | |
DE102018104721A1 (en) | VEHICLE EXHAUST SYSTEM WITH VARIABLE EXHAUST TREATMENT INJECTOR SYSTEM | |
DE102016219548A1 (en) | Ammonia slip detection | |
DE112011103238T5 (en) | Exhaust system with multi-sensitive sensor | |
DE102006007122A1 (en) | Operating process for internal combustion engine involves reporting suitable combinations of engine operating values for preset nitrogen oxide emission value | |
DE102009035304C5 (en) | System for purifying exhaust gas | |
DE102010047809A1 (en) | Systems and methods for controlling regeneration of nitrogen oxide adsorbers | |
DE102009059859A1 (en) | Thermal protection system for reducing agent injection device | |
DE102016222010B4 (en) | Method for controlling an internal combustion engine with a low-pressure exhaust gas recirculation system | |
DE102011105601B4 (en) | A control system for regenerating a particulate matter filter using a catalytic converter as a combustor |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
R012 | Request for examination validly filed | ||
R082 | Change of representative |
Representative=s name: MANITZ FINSTERWALD PATENT- UND RECHTSANWALTSPA, DE Representative=s name: MANITZ FINSTERWALD PATENTANWAELTE PARTMBB, DE |
|
R016 | Response to examination communication | ||
R018 | Grant decision by examination section/examining division | ||
R020 | Patent grant now final | ||
R119 | Application deemed withdrawn, or ip right lapsed, due to non-payment of renewal fee |